Fishplate Material xaiv thiab kev sib koom ua ke nruj tswj
Dab tsi yog qhov kev txhawb zog ntawm 20MnTiB alloy steel fishplates?
Lub 20MnTiB alloy steel fishplate ua tiav kev ua tau zoo los ntawm cov khoom siv hlau ntxiv thiab kev kho cua sov, nrog rau kev pom tseeb. Manganese tuaj yeem txhim kho cov tawv tawv thiab lub zog ntawm cov hlau, titanium tuaj yeem kho cov nplej thiab txhim kho toughness, thiab boron ntxiv txhim kho hardenability, synergistically txhim kho cov khoom siv txhua yam. Thaum lub sij hawm tsim khoom, quenching thiab tempering kev kho mob yuav tsum tau ua: thawj quenching rau 900-920 degree, ces siab-kub tempering rau 550-600 degree, kom cov hlau tau ib tug tempered sorbite qauv, ntsuas lub zog thiab toughness. Cov txheej txheem no tuaj yeem ua rau lub phaj phaj muaj lub zog tensile Ntau dua lossis sib npaug ntawm 800MPa thiab lub zog tawm los Ntau dua lossis sib npaug rau 650MPa, deb tshaj li cov pa roj carbon steel fishplates. Nyob rau tib lub sijhawm, cov ntsiab lus alloy tuaj yeem txhim kho corrosion kuj ntawm cov hlau, txo cov xeb ntawm ntau tshaj 50% hauv qhov chaw ntub dej. Los ntawm kev sib xyaw kom zoo thiab kev tswj xyuas cov txheej txheem, 20MnTiB ntses phaj ua tiav kev sib koom ua ke ntawm lub zog siab, siab tawv thiab siab corrosion kuj, yoog raws cov kev xav tau ntawm cov kab hnyav.
Dab tsi yog qhov kev tiv thaiv -corrosion zoo thiab cov xwm txheej cuam tshuam ntawm txawv teb chaws tus qauv stainless hlau fishplates?
Txawv txawv tus qauv stainless hlau fishplates yog ua los ntawm 304 los yog 316 stainless hlau, nrog rau qhov tseem ceeb los tiv thaiv -corrosion zoo thiab hloov mus rau qhov chaw tshwj xeeb. Lub 304 stainless hlau ntses phaj tuaj yeem tiv taus cov av noo thiab cov ntsev me me-alkali ib puag ncig, nrog rau kev ntsuas ntsev ntsev lub neej Ntau dua lossis sib npaug li 5000 teev, uas yog 2-3 npaug ntawm carbon steel. 316 stainless hlau muaj zog pitting corrosion kuj vim qhov sib ntxiv ntawm molybdenum, thiab tuaj yeem hloov mus rau ntug dej hiav txwv. siab- ntsev tsuag thiab muaj zog corrosion puag ncig, nrog rau ntsev tsuag lub neej Ntau dua los yog sib npaug li 8000 teev. Stainless hlau tsis tas yuav muaj kev tiv thaiv corrosion ntxiv, thiab tom qab tu tus nqi qis heev, thaum carbon steel fishplates xav tau pleev xim rau kev tiv thaiv xeb. Cov phaj ntses yog tsim rau cov ntug hiav txwv railways, saline -alkali cheeb tsam kab thiab electrified railways, thiab tuaj yeem zam kev sib koom ua ke los ntawm corrosion. Nws kuj muaj qhov zoo weldability thiab siv tau nrog stainless hlau rails los xyuas kom meej tag nrho los tiv thaiv -corrosion nyhuv ntawm cov pob qij txha, ua rau nws yog thawj xaiv rau txawv teb chaws tus qauv high-corrosion ib puag ncig kab.
Vim li cas lub siab - txoj kab tsheb ciav hlau ceev muaj cov kev cai nruj rau cov ntses phaj sib koom ua ke?
Lub siab smoothness thiab kev nyab xeeb siab ntawm high - cov kab tsheb ciav hlau ceev txiav txim siab qhov yuav tsum tau ua rau ntses phaj sib koom ua ke. High- cov tsheb ciav hlau ceev khiav ntawm qhov ceev Ntau dua lossis sib npaug li 300 km / h, thiab lub log - kev tsheb ciav hlau sib cuam tshuam muaj zog. Kev sib koom ua ke tsis txaus yuav ua rau muaj kev cuam tshuam ntau dhau ntawm cov pob qij txha thiab ua rau lub log-rail cuam tshuam. Kev sib koom ua ke yuav tsum muaj ntau dua lossis sib npaug ntawm 70kN / mm txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau yog qhov sib npaug ntawm 70 kN / hli yuav tsum ua kom muaj kev sib haum xeeb ntawm cov pob qij txha, kom qhov kev vibration acceleration thaum lub tsheb ciav hlau hla tsawg dua lossis sib npaug li 0.5g thiab txhim kho kev caij tsheb. Kev nruj tsis txaus yuav ua rau lub log hnyav dua- kev tsheb ciav hlau hnav ntawm cov pob qij txha, ua rau lub neej ua haujlwm luv luv ntawm cov tsheb ciav hlau thiab lub log, thiab nce nqi kho. Cov kev cai nruj nruj tuaj yeem ua kom muaj kev sib kis tsis sib xws ntawm cov pob qij txha, kom tsis txhob muaj kev sib tsoo ntawm cov ntses los ntawm kev ntxhov siab, thiab ua kom muaj kev nyab xeeb ntawm kev tsav tsheb. Nyob rau tib lub sijhawm, kev sib koom ua ke ruaj khov tuaj yeem txo cov kev hloov pauv hauv txoj haujlwm geometric, txo cov kab ntau zaus, thiab hloov mus rau qhov siab - ceev thiab siab - cov yam ntxwv ua haujlwm ceev ntawm high{16}} kev tsheb ciav hlau ceev.
Dab tsi yog cov txheej txheem tshawb nrhiav thiab cov qauv rau kev sib koom ua ke ntawm fishplate?
Cov ntses phaj sib koom ua ke yuav tsum tau lav kom ua tau raws li tus qauv los ntawm kev paub txog kev tshaj lij, thiab cov txheej txheem tshawb nrhiav thiab cov qauv muaj cov lus qhia meej. Kev kuaj pom tau siv txoj kev thauj khoom zoo li qub, siv ntsug load ntawm qhov sib koom ua ke, ntsuas qhov load-deformation nkhaus, thiab xam cov nqi sib koom ua ke. Lub teb chaws tus txheej txheem tau teev tseg tias qhov sib koom ua ke ntawm siab - cov kab tsheb ciav hlau ceev yog ntau dua lossis sib npaug li 70kN / hli, cov kab nrawm nrawm dua lossis sib npaug li 50kN / hli, hnyav- cov kab tsheb loj dua lossis sib npaug li 60kN / hli, thiab qhov sib txawv tsawg dua lossis sib npaug li 5% yog qhov tsim nyog. Cov qauv txawv teb chaws xws li EN13146 xav kom lub deformation ntawm kev sib koom ua ke nruj hauv qab 100kN load tsawg dua los yog sib npaug rau 1.5 hli, thiab qhov tawv nqaij attenuation tom qab peb lub loading thiab unloading cycles tsawg dua los yog sib npaug li 3%. Thaum kuaj pom, ntsuas cov ntsiab lus yuav tsum tau teem nyob rau hauv 3m ntawm ob sab ntawm kev sib koom ua ke kom paub meej cov ntaub ntawv, thiab qhov ntsuas kub yuav tsum tau sau tseg kom them nyiaj rau qhov kub ntawm qhov tawv nqaij. Cov cuab yeej kuaj xyuas yuav tsum tau ntsuas tsis tu ncua nrog qhov tseeb qhov yuam kev tsawg dua lossis sib npaug li ± 2%. Tom qab kuaj pom, daim ntawv tshaj tawm kev tshawb pom yuav tsum tau muab los ua lub hauv paus tseem ceeb rau kev txais kab thiab kev saib xyuas.
Dab tsi yog shear kev ua tau zoo ntsuas ntawm cov ntses rau hnyav -cov kab?
Lub qag hnyav hnyav ntawm qhov hnyav - cov kab tsheb thauj khoom yog qhov ua rau ua rau tsis ua haujlwm ntawm cov ntses, yog li yuav tsum muaj ntau yam kev ntsuas los txhawb lawv txoj kev ua haujlwm shear. Hais txog cov khoom siv, 20MnTiB alloy steel nrog ntau dua shear zog yog xaiv, nws lub zog shear yog Ntau dua lossis sib npaug li 450MPa, 30% siab dua li cov pa roj carbon zoo tib yam. Hais txog cov qauv, qhov kev ntxhov siab-cov kabmob ntawm cov phaj phaj yog thickened, lub thickness nyob ib ncig ntawm lub bolt qhov yog nce mus rau 30mm los txhim khu lub zos shear resistance, thiab cov txheej txheem ntawm lub qhov ntsia liaj qhov rooj yog optimized kom sib npaug zos shear quab yuam ntawm txhua bolts. Cov bolts yog 10.9-qib siab-lub zog shear-cov bolts uas muaj peev xwm shearing muaj peev xwm ntau dua lossis sib npaug li 200kN, thiab cov txiv ntseej ob npaug yog siv los tiv thaiv- xoob kom tsis txhob muaj kev sib tsoo los ntawm cov bolt loosening. Thaum lub sij hawm installation, ib tug shear{18}}resistant gasket yog ntsia nruab nrab ntawm lub phaj phaj thiab lub tsheb ciav hlau, nrog ib tug hardness Ntau tshaj los yog sib npaug rau HRC50, muab ib feem ntawm lub shear load thiab tiv thaiv cov ntses. Regular ultrasonic flaw detection is performed on fishplates to detect internal shear cracks in a timely manner and replace failed components in advance to ensure the safety of heavy-haul line joints.